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Hi Dennis,
I think you shouldn't hesitate to use PEMPro. It is quite easy and the results have always worked for me. My MEII has very good uncorrected PE (~2.5 ArcSec PTP) but after correction has gone down to .6 PTP. Admittedly you need a very good steady night to get this result. If you want to guide, well Fred is correct, you can guide it out. However, if you want good unguided results a good PEC is required!
Also, if you have a good model you really only need to recalibrate the data. You don't need so many points to recalibrate and this can save a lot of time!
Peter
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